I'd have no problem accepting a large sum denominated in pennies only, provided the count was accurate and a good portion of the hoard were of the copper variety. (With copper at approx. $2.60/lb., the melt value of each cent is nearly double.)

[EDIT: Value of copper already mentioned by Dado in post #17, and may be a motivator to accept a large quantity provided you have the technology to separate the copper cents from the steel stuff currently pounded out by the mint.]

And guess what, YOU HAVE NO Clue what youre talking about.
Copper Penies no longer exist. They are 99% zinc. Enjoy your garbage metal.